Bulk Insert causing duplicates in target table
We use ETL tool(C# based) which uses Bulkcopy method to do bulk insert to target table. Recently we are facing 2 Issues in our daily loads 1. Target table with no primary key - the load returns success but it inserts 5x times of the same record. It loads same records 5 times. 2. Target table with Primary Key - The load returns failure with primary key constraint but it inserts the rows into target table. DBA Team is unable to find anything in there logs ,So I am confused why this error occurs. This occurs daily in 10% of the jobs and once you rerun after 2-3 hrs the same job finishes successfully without above mentioned issues. Please suggest how can I debug this issue.